Head trimmer



FIG. 1 is a perspective view of a head trimmer, showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings represent unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a head trimmer, as shown and described. 